N = int(input())
MOD = 998244353
def exp(mat_a, mat_b):
    new_mat = [[0]*len(mat_a) for _ in range(len(mat_a))]
    for i in range(len(mat_a)):
        for j in range(len(mat_a)):
            new_mat[i][j] = sum(mat_a[i][w]*mat_b[w][j] % MOD for w in range(len(mat_a))) % MOD
    return new_mat

ANS = [[1,0],[0,1]]
MAP = [[1,1],[1,0]]
K = N
while K:
    if K & 1:
        ANS = exp(ANS, MAP)
    MAP = exp(MAP, MAP)
    K //= 2
print((ANS[0][0]-1)%MOD)